Electromagnetic valve with detection circuit and fire extinguishing system

Abstract

The utility model provides a kind of solenoid valve with detection circuit, solenoid valve includes coil and cable, cable is configured to be electrically connected with coil and provide actuating signal for coil to actuate solenoid valve, detection circuit includes diode and resistance, resistance is connected in parallel with coil, diode is connected in series with resistance and coil, cable is also configured to be able to provide detection signal at the two ends of coil and resistance, and detection signal is current signal, cable includes first sub-cable and second sub-cable, first sub-cable, detection circuit and second sub-cable are electrically connected in sequence.The utility model also provides a kind of fire extinguishing system comprising the solenoid valve.The solenoid valve and fire extinguishing system can avoid that fire extinguishing system cannot be normally started due to poor contact between pin and solenoid valve connector, thereby improving the reliability of fire extinguishing system.

Description

Technical Field

[0001] This utility model relates to the field of cold-rolled steel technology, and in particular to a fire extinguishing system in cold-rolled steel production. Background Technology

[0002] In cold rolling mills, high-pressure carbon dioxide fire suppression systems rely on a gas (usually nitrogen) as the driving medium to trigger the opening of the valve on the carbon dioxide storage cylinder. The reliability of this driving gas directly affects the effectiveness of the entire fire suppression system. Especially in the event of a strip breakage accident during the cold rolling process, the high-pressure carbon dioxide fire suppression system must be able to respond immediately and implement spray extinguishing to quickly suppress the fire risk.

[0003] However, a significant hidden danger exists in the existing system design: the connection status of the nitrogen storage cylinder solenoid valve lacks an effective detection mechanism. The DC24V electrical connection between the solenoid valve and the start signal relies on a mechanical connection between the pin and the fixing screw. During long-term use, frequent disassembly and natural oxidation can easily lead to poor contact between the pin and the solenoid valve connector, resulting in decreased circuit continuity. This problem could prevent the fire suppression system from activating properly in the event of a strip breakage in the cold rolling mill, thus delaying firefighting efforts and significantly increasing the risk of fire spread. Utility Model Content

[0004] The purpose of this invention is to provide a solenoid valve with a detection circuit and a fire extinguishing system including the solenoid valve, so as to avoid the fire extinguishing system failing to start normally due to poor contact between the pin and the solenoid valve connector, thereby improving the reliability of the fire extinguishing system.

[0005] According to one aspect of the present invention, a solenoid valve with a detection circuit is provided. The solenoid valve includes a coil and a cable. The cable is configured to be electrically connected to the coil and to provide an actuation signal to the coil to actuate the solenoid valve. The detection circuit includes a diode and a resistor. The resistor is connected in parallel with the coil, and the diode, resistor, and coil are connected in series. The cable is also configured to provide a detection signal at both ends of the coil and the resistor. The detection signal is a current signal. The cable includes a first sub-cable and a second sub-cable. The first sub-cable, the detection circuit, and the second sub-cable are electrically connected in sequence.

[0006] According to the above scheme, by continuously monitoring the voltage across the resistor, the connection status between the solenoid valve coil and the cable can be obtained. This allows the operator to be alerted to take appropriate action when poor contact occurs between the solenoid valve coil and the cable, preventing the fire extinguishing system from failing to start due to poor contact between the pin and the solenoid valve connector, thereby improving the reliability of the fire extinguishing system. This solenoid valve has a simple structure, low cost, can respond quickly to poor contact, and is compatible with existing fire extinguishing systems.

[0007] Furthermore, when there is poor contact between the solenoid valve coil and the cable, the diode in the circuit ensures that the current must pass through the resistor. Therefore, the detection circuit with the diode can prevent any possible reverse or bypass current in the circuit, ensuring the uniqueness of the current path, thereby generating a stable, accurate, and reliable detection voltage across the resistor, improving the accuracy and reliability of diagnosing the connection status between the solenoid valve coil and the cable.

[0008] In one embodiment, the cable includes a DC power supply conductor configured to be adapted to an actuation signal as a DC voltage signal.

[0009] In one implementation, when the coil is electrically connected to the cable, the voltage value generated at both ends of the coil by the detection signal is less than that of the actuation signal.

[0010] In one embodiment, the solenoid valve further includes a voltage sensor connected across the resistor to measure the voltage across the resistor.

[0011] In one implementation, the resistance value is greater than the coil resistance value.

[0012] In one implementation, the detection circuit is connected to a constant current source module, which is integrated at the cable interface and configured to continuously output a detection signal.

[0013] According to another aspect of the present invention, a fire extinguishing system is provided, comprising a monitoring module, an alarm module, and at least one of the aforementioned solenoid valves. The monitoring module includes a voltage comparison circuit configured to control the alarm module to issue an alarm signal based on the voltage value across a resistor.

[0014] In one implementation, the monitoring module is configured to control the alarm module to issue an alarm signal when the voltage value exceeds a predetermined threshold.

[0015] In one implementation, the fire extinguishing system is a carbon dioxide fire extinguishing system.

[0016] In one embodiment, the carbon dioxide fire extinguishing system includes a carbon dioxide storage cylinder and a nitrogen storage cylinder. The carbon dioxide storage cylinder includes a cylinder head valve configured to allow the release of carbon dioxide when open and to prevent the release of carbon dioxide when closed. A solenoid valve is configured to open the nitrogen storage cylinder when actuated, such that nitrogen gas released from the nitrogen storage cylinder opens the cylinder head valve, thereby releasing carbon dioxide gas.

[0017] According to the above scheme, the solenoid valve with detection circuit can reflect the connection status between the solenoid valve coil and the cable through the voltage value across the resistor. Therefore, once a fault such as poor contact occurs between the solenoid valve coil and the cable, it can promptly alert the operator to avoid the carbon dioxide fire extinguishing system failing to start normally, thereby improving the reliability of the carbon dioxide fire extinguishing system. Attached Figure Description

[0018] To better understand the above and other objects, features, advantages, and functions of this utility model, reference can be made to the preferred embodiments shown in the accompanying drawings. The same reference numerals in the drawings refer to the same parts. Those skilled in the art should understand that the drawings are intended to schematically illustrate the preferred embodiments of this utility model and do not limit the scope of this utility model in any way; the parts in the drawings are not drawn to scale.

[0019] Figure 1 A schematic diagram of the detection circuit of the solenoid valve in an embodiment of this utility model is shown.

[0020] Explanation of reference numerals in the attached figures: Detailed Implementation

[0021] Now, with reference to the accompanying drawings, specific embodiments of the present invention will be described in detail. The embodiments described herein are merely preferred embodiments of the present invention; those skilled in the art can conceive of other ways to implement the present invention based on these preferred embodiments, and such other ways also fall within the scope of the present invention.

[0022] like Figure 1 As shown, this utility model provides a solenoid valve 101 with a detection circuit, which can be used to detect the connection status between the solenoid valve coil 3 and the cable 6 in real time. The solenoid valve 101 includes a solenoid valve body 1 and a solenoid valve connector 2. The solenoid valve connector 2 can be electrically connected to the pins of the solenoid valve body 1 to supply power to the solenoid valve coil 3 disposed in the solenoid valve body 1. The solenoid valve connector 2 is provided with a cable 6.

[0023] When cable 6 is connected to solenoid valve coil 3 via pins or other means, cable 6 can provide an actuation signal to solenoid valve coil 3, causing the plunger in the valve body 1 to be actuated, thereby opening the passage inside the valve body. Cable 6 includes a DC power supply wire and is configured to be compatible with the actuation signal as a DC voltage signal. For example, the actuation signal can be a DC voltage signal such as DC12V, DC24V, or DC48V. Optionally, the actuation signal can also be an AC voltage, such as AC220V.

[0024] The detection circuit may include a resistor 4, which is configured to be connected in parallel with the solenoid valve coil 3. The solenoid valve cable 6 may also be configured to apply a detection signal across the parallel-connected coil 3 and resistor 4, the detection signal being used to detect the connection status between the solenoid valve coil 3 and the cable 6. The detection signal may be a continuous, stable current signal. In other words, the detection circuit may be connected to a constant current source module, integrated at the cable interface and configured to continuously output the detection signal.

[0025] In the aforementioned exemplary solenoid valve, cable 6 can provide both an actuation signal to the solenoid valve coil 3 to activate the valve body and a detection signal to detect the cable connection status. To prevent the valve body from being actuated and accidentally opening internal passages during cable connection detection, the detection signal can be a micro-current, such as a few milliamps to several hundred milliamps. When the solenoid valve coil 3 and cable 6 are electrically connected via pins or similar means, i.e., when there is good contact, the voltage value generated across the solenoid valve coil 3 by the detection signal is less than the voltage value required to actuate the solenoid valve, i.e., less than the voltage value of the actuation signal. The aforementioned current value of the detection signal is merely exemplary, and this invention does not intend to limit the magnitude of the current value of the detection signal, as long as it satisfies or ensures that the solenoid valve will not be accidentally opened during cable connection detection.

[0026] Because a detection circuit including resistor 4 is added to the solenoid valve 101, the operator can detect and obtain the connection status between the solenoid valve coil 3 and the cable 6. Specifically, when the contact between the solenoid valve coil 3 and the cable 6 is good, the detection current flows through the solenoid valve coil 3, and at this time there is no voltage or a very small voltage across the resistor 4; when the contact between the solenoid valve coil 3 and the cable 6 is poor (for example, an open circuit or a very high resistance due to natural oxidation), the detection current cannot pass through the solenoid valve coil 3, but flows almost entirely through the resistor 4, and at this time the corresponding voltage value can be detected across the resistor 4.

[0027] By continuously monitoring the voltage across resistor 4, the connection status between the solenoid valve coil 3 and cable 6 can be obtained. This allows the operator to be alerted to take appropriate action when there is poor contact between the solenoid valve coil 3 and cable 6, preventing the fire extinguishing system from failing to start due to poor contact between the pin and the solenoid valve connector 2, thereby improving the reliability of the fire extinguishing system. The solenoid valve 101 with detection circuit provided by this invention has a simple structure, low cost, can respond quickly to poor contact, and is compatible with existing fire extinguishing systems.

[0028] The detection circuit may also include diode 5. Diode 5 is connected in series with resistor 4 and solenoid coil 3. That is, in the equivalent circuit including diode 5 and resistor 4, the positive terminal of the current source is connected to one end of diode 5, while the negative terminal of the current source is connected to one end of solenoid coil 3 and resistor 4. The positive and negative terminals of the current source are forward biased with respect to the positive and negative terminals of diode 5 to ensure that diode 5 can conduct in the forward direction when the current source provides a current signal to the detection circuit.

[0029] In the equivalent circuit of this embodiment, diode 5 acts as a "current check valve," forcing the current to flow only in a predetermined direction. That is, when there is poor contact between the solenoid valve coil 3 and the cable 6, diode 5 in the circuit ensures that the current must pass through the resistor. Therefore, the detection circuit with diode 5 can prevent any possible reverse or bypass current in the circuit, ensuring the uniqueness of the current path, thereby generating a stable, accurate, and reliable detection voltage across resistor 4, improving the accuracy and reliability of diagnosing the connection status between the solenoid valve coil 3 and the cable 6.

[0030] In the exemplary solenoid valve 101, the detection circuit and the cable 6 are electrically connected via physical terminals. Further, the cable 6 may include a first sub-cable and a second sub-cable. The first sub-cable, the detection circuit, and the second sub-cable are sequentially electrically connected via physical terminals. That is, the detection circuit is disposed between the first and second sub-cables. Specifically, one end of the first sub-cable is connected to the solenoid valve connector 2, and then to the solenoid valve coil 3 via a pin; the other end is connected to the detection circuit. The end of the detection circuit away from the first sub-cable is connected to one end of the second sub-cable, and the other end of the second sub-cable can be connected to a power source.

[0031] The solenoid valve 101 in this embodiment may further include a voltage sensor for measuring the voltage across the resistor 4. The voltage sensor may be connected across the resistor 4. Additionally, the voltage sensor may be disposed together with the detection circuit between the first sub-cable and the second sub-cable.

[0032] To ensure that the connection status between the solenoid valve coil 3 and the cable 6 can be accurately obtained through the detection circuit, the resistance value of the resistor 4 in the detection circuit can be greater than the resistance value of the solenoid valve coil 3. Preferably, the resistance value of the resistor 4 in the detection circuit can be much greater than the resistance value of the solenoid valve coil 3. For example, the resistance value of the resistor 4 can be 2 to 10 times the resistance value of the solenoid valve coil 3, such as 2 times, 3 times, 5 times, 10 times, etc.

[0033] In one embodiment, the detection circuit is connected to a constant current source module, which is configured to continuously output a detection signal. Preferably, the constant current source module can provide a continuous and stable detection signal 24 hours a day to ensure that the connection status between the solenoid valve coil 3 and the cable 6 can be continuously detected in real time.

[0034] like Figure 1 As shown, this utility model also provides a fire extinguishing system 100, which may include at least one solenoid valve 101 with a detection circuit. Furthermore, the fire extinguishing system may also include a monitoring module 102 and an alarm module 103. The monitoring module 102 and the alarm module 103 may be embedded hardware circuits, used to monitor and alarm the connection status between the solenoid valve coil 3 and the cable 6, respectively. The monitoring module 102 may include a voltage comparison circuit configured to control the alarm module 103 to issue an alarm signal based on the voltage value across the resistor 4, for example, based on the voltage value detected by a voltage sensor. The voltage sensor can be communicatively connected to the monitoring module 102 and sends the detected voltage value across the resistor 4 to the monitoring module 102.

[0035] The monitoring module 102 can communicate with the alarm module 103. When the monitoring module 102 determines that the voltage across the resistor 4 exceeds a predetermined threshold, it can send a control signal to the alarm module 103 to control the alarm module 103 to issue a corresponding alarm signal.

[0036] The alarm module 103 may include devices such as speakers and displays that can output alarm signals. The alarm signals may include auditory signals, visual signals, or tactile signals that can be directly recognized by the operator, or graphic signals that can be displayed on a display device, or a combination of the above signals.

[0037] A universal switch 104 may also be provided between the monitoring module 102 and the solenoid valve connector 2, and especially between the monitoring module 102 and the detection circuit.

[0038] As an example, the aforementioned fire extinguishing system could be a carbon dioxide fire extinguishing system. A carbon dioxide fire extinguishing system may also include a carbon dioxide storage cylinder, which stores liquid carbon dioxide.

[0039] The carbon dioxide storage cylinder is equipped with a cylinder head valve at the outlet, which is used to control the release of carbon dioxide. When the cylinder head valve is open, carbon dioxide can be released from the carbon dioxide storage cylinder; when the cylinder head valve is closed, the closed cylinder head valve prevents the release of carbon dioxide.

[0040] The carbon dioxide fire extinguishing system also includes a nitrogen storage cylinder for storing liquid nitrogen. The solenoid valve 101 in the above embodiment controls the opening and closing of the nitrogen storage cylinder. Specifically, when the solenoid valve 101 is actuated, a passage is created within the valve body of the solenoid valve 101, through which nitrogen gas in the nitrogen storage cylinder is released. When the solenoid valve 101 is closed, the passage within the valve body of the solenoid valve 101 is cut off, preventing nitrogen gas from leaving the nitrogen storage cylinder through this passage. The nitrogen gas released from the nitrogen storage cylinder is used to open the cylinder valve of the carbon dioxide storage cylinder, thereby releasing carbon dioxide gas.

[0041] As described above, the solenoid valve 101 with detection circuit can reflect the connection status between the solenoid valve coil 3 and the cable 6 through the voltage value across the resistor 4. Therefore, if a fault such as poor contact occurs between the solenoid valve coil 3 and the cable 6, it can promptly alert the operator to avoid the fire extinguishing system failing to start normally, thereby improving the reliability of the fire extinguishing system.

[0042] The above description of various embodiments of this utility model is provided for descriptive purposes to a person skilled in the art. It is not intended to exclude or limit the utility model to a single disclosed embodiment. As taught above, those skilled in the art will understand that various alternatives and variations of this utility model are possible. Therefore, although some alternative embodiments have been specifically described, those skilled in the art will understand or relatively easily develop other embodiments. This utility model is intended to include all alternatives, modifications, and variations of the utility model described herein, as well as other embodiments falling within the spirit and scope of the utility model described above.

Claims

1. A solenoid valve with a detection circuit, characterized in that, The solenoid valve includes a coil and a cable, the cable being configured to be electrically connected to the coil and provide an actuation signal to the coil to actuate the solenoid valve. The detection circuit includes a diode and a resistor, the resistor being connected in parallel with the coil, and the diode being connected in series with both the resistor and the coil. The cable is also configured to provide a detection signal across the coil and the resistor, and the detection signal is a current signal. The cable includes a first sub-cable and a second sub-cable, and the first sub-cable, the detection circuit, and the second sub-cable are electrically connected in sequence.

2. The solenoid valve according to claim 1, characterized in that, The cable includes a DC power supply conductor configured to be adapted to the actuation signal as a DC voltage signal.

3. The solenoid valve according to claim 2, characterized in that, When the coil is electrically connected to the cable, the voltage value generated by the detection signal at both ends of the coil is less than that of the actuation signal.

4. The solenoid valve according to claim 1, characterized in that, The solenoid valve also includes a voltage sensor connected across the resistor to measure the voltage across the resistor.

5. The solenoid valve according to claim 1, characterized in that, The resistance value of the resistor is greater than the resistance value of the coil.

6. The solenoid valve according to claim 1, characterized in that, The detection circuit is connected to a constant current source module, which is integrated at the interface of the cable and configured to continuously output the detection signal.

7. A fire extinguishing system, characterized in that, The fire extinguishing system includes a monitoring module, an alarm module, and a solenoid valve according to any one of claims 1 to 6. The monitoring module includes a voltage comparison circuit configured to control the alarm module to issue an alarm signal based on the voltage value across the resistor.

8. The fire extinguishing system according to claim 7, characterized in that, The monitoring module is configured to control the alarm module to issue an alarm signal when the voltage value exceeds a predetermined threshold.

9. The fire extinguishing system according to claim 8, characterized in that, The fire extinguishing system is a carbon dioxide fire extinguishing system.

10. The fire extinguishing system according to claim 9, characterized in that, The carbon dioxide fire extinguishing system includes carbon dioxide storage cylinders and nitrogen storage cylinders. The carbon dioxide storage cylinder includes a valve head configured to allow the release of carbon dioxide when open and to prevent the release of carbon dioxide when closed. The solenoid valve is configured to open the nitrogen storage cylinder when actuated, so that the nitrogen gas released from the nitrogen storage cylinder opens the cylinder head valve, thereby releasing carbon dioxide gas.

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